NDLI: Diet-induced milk fat depression is associated with alterations in ruminal biohydrogenation pathways and formation of novel fatty acid intermediates in lactating cows.

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Diet-induced milk fat depression is associated with alterations in ruminal biohydrogenation pathways and formation of novel fatty acid intermediates in lactating cows.

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Diet-induced milk fat depression is associated with alterations in ruminal biohydrogenation pathways and formation of novel fatty acid intermediates in lactating cows.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Ventto, Laura Leskinen, Heidi Kairenius, Piia Stefanski, Tomasz Bayat, Ali R. Vilkki, Johanna Shingfield, Kevin J.
Description	Country affiliation: Finland Author Affiliation: Ventto L ( 1Nutritional Physiology,Green Technology,Natural Resources Institute Finland (Luke),FI-31600 Jokioinen,Finland.); Leskinen H ( 1Nutritional Physiology,Green Technology,Natural Resources Institute Finland (Luke),FI-31600 Jokioinen,Finland.); Kairenius P ( 1Nutritional Physiology,Green Technology,Natural Resources Institute Finland (Luke),FI-31600 Jokioinen,Finland.); Stefanski T ( 1Nutritional Physiology,Green Technology,Natural Resources Institute Finland (Luke),FI-31600 Jokioinen,Finland.); Bayat AR ( 1Nutritional Physiology,Green Technology,Natural Resources Institute Finland (Luke),FI-31600 Jokioinen,Finland.); Vilkki J ( 2Animal Genomics,Green Technology,Natural Resources Institute Finland (Luke),FI-31600 Jokioinen,Finland.); Shingfield KJ ( 1Nutritional Physiology,Green Technology,Natural Resources Institute Finland (Luke),FI-31600 Jokioinen,Finland.)
Abstract	The biohydrogenation theory of milk fat depression (MFD) attributes decreases in milk fat in cows to the formation of specific fatty acids (FA) in the rumen. Trans-10, cis-12-CLA is the only biohydrogenation intermediate known to inhibit milk fat synthesis, but it is uncertain if increased ruminal synthesis is the sole explanation of MFD. Four lactating cows were used in a 4×4 Latin square with a 2×2 factorial arrangement of treatments and 35-d experimental periods to evaluate the effect of diets formulated to cause differences in ruminal lipid metabolism and milk fat synthesis on the flow of FA and dimethyl acetal at the omasum. Treatments comprised total mixed rations based on grass silage with a forage:concentrate ratio of 35:65 or 65:35 containing 0 or 50 g/kg sunflower oil (SO). Supplementing the high-concentrate diet with SO lowered milk fat synthesis from -20·2 to -31·9 % relative to other treatments. Decreases in milk fat were accompanied by alterations in ruminal biohydrogenation favouring the trans-10 pathway and an increase in the formation of specific intermediates including trans-4 to trans-10-18 : 1, trans-8, trans-10-CLA, trans-9, cis-11-CLA and trans-10, cis-15-18 : 2. Flow of trans-10, cis-12-CLA at the omasum was greater on high- than low-concentrate diets but unaffected by SO. In conclusion, ruminal trans-10, cis-12-CLA formation was not increased on a diet causing MFD suggesting that other biohydrogenation intermediates or additional mechanisms contribute to the regulation of fat synthesis in the bovine mammary gland.
File Format	HTM / HTML
ISSN	00071145
Issue Number	3
Journal	British Journal of Nutrition
Volume Number	117
e-ISSN	14752662
Language	English
Publisher	Cambridge University Press (on behalf of The Nutrition Society)
Publisher Date	2017-02-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Nutrition and Dietetics Medicine

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